Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

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Re: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

Post by reecho » Thu, 20 Sep 2018, 20:00

Thats a pretty expensive fire. $5K per Killawhatevertheyare and 2 x PIP clones. Plus the Victron MPPT charge controller.

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Re: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

Post by Richo » Tue, 25 Sep 2018, 12:50

Annon wrote: Two problems here:
1. Supercapacitors do not explode or burn during over-charge
2. Where are the protection circuits?
1.
Can't say I've tried over-charging given that generic supercaps costs are high.
I would have thought they explode in a ball of fire like any other cap.
More-so since they have an extremely high discharge current.

2.
Well I'm under the impression they are an active cap-cap balance.
It won't protect against cap to cap shorts.
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Re: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

Post by Richo » Tue, 25 Sep 2018, 13:08

Do I hear an echo, echo, echo....
Richo wrote:
Thu, 31 May 2018, 12:28
from what I understand Arvio are either in on the scam or have been duped by it - probably the latter.
Its just unfortunate that if a claim against this product is made in Australia it will be the importer, Arvio, that will suffer.
And given this has been part funded by the VIC govt we are talking Millions of $$.

This is why I mentioned that they are better off having one independently tested.
$3.5k vs $3.5M
At least they could say they made an effort to determine if the product was fraudulent.
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Re: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

Post by Richo » Tue, 25 Sep 2018, 13:10

Perhaps Arvio could have a fire sale on both accounts...
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Re: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

Post by jonescg » Tue, 25 Sep 2018, 17:49

Richo wrote:
Tue, 25 Sep 2018, 13:10
Perhaps Arvio could have a fire sale on both accounts...
Badoom-tish! :lol:
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Re: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

Post by Adverse Effects » Tue, 25 Sep 2018, 21:45

Richo wrote:
Tue, 25 Sep 2018, 13:10
Perhaps Arvio could have a fire sale on both accounts...
ROFL
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When will you have time to do it over

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Re: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

Post by TCryptos » Wed, 26 Sep 2018, 08:34

This is why I mentioned that they are better off having one independently tested.
One would have thought that opening the case and seeing the bits of wood, cardboard, tape and hot melt glue might have been an itsy-bitsy clue.

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Re: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

Post by Mikem » Wed, 26 Sep 2018, 10:10

Hi All,

Have been following this thread with great interest and we have been able to get our hands on a 3.5KW unit and open it up.
The unit was supposed to be fully discharged, having run a water heater overnight. Measuring across the terminals, we found about 30V.
We are certainly not electrical minded people so if there are any tests or measurements you guys could suggest it would be appreciated.
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Last edited by Mikem on Wed, 03 Oct 2018, 09:31, edited 1 time in total.

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Re: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

Post by Richo » Wed, 26 Sep 2018, 12:39

Mikem wrote:
Wed, 26 Sep 2018, 10:10
The unit was supposed to be fully discharged, having run a water heater overnight. Measuring across the terminals, we found about 30V.
In a "capacitor" system not all of the stored energy can actually be used.
So at some point a DC/DC that keeps the output useable will shut down even though there is voltage left in the system.

It is also likely that the unit will not output power due to a low voltage shut off to simulate a "flat battery".

To complicate it further you can actually get hybrid capacitors that have a high and low voltage like a battery.
https://au.element14.com/c/passive-comp ... d=vinatech
So even when 90%+ energy is used there still is voltage.

Pulling a single cell out of the unit and doing a CC charge and discharge should show if it is a cap or battery.
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Re: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

Post by Richo » Wed, 26 Sep 2018, 12:52

So the balance wires from each block of parallel "cap" is cable tied to it neighbour and runs off to the balance board.
Should ANY joint fail and short out anywhere - BOOM.

Not to mention the extra heat from bundling all the wires together would have to be de-rated to be safe.
Should the middle wire get too hot and melt the insulation - BOOM.

And I am definitely not keen on the soldering wires to silpins with no heatshrink or silicone.
Oh and the 2 wires on the left half way up the pic - it HAS heatshrink but doesn't actually cover the joint - classic.

Image
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Re: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

Post by T1 Terry » Wed, 26 Sep 2018, 14:38

Oh and the 2 wires on the left half way up the pic - it HAS heatshrink but doesn't actually cover the joint - classic.
That's an over heat indicator. If it's been too hot the heat shrink will be tight on the wire as an indicator it has been hot at some time, charred black means it has been on fire at some time :twisted:

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Re: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

Post by T1 Terry » Wed, 26 Sep 2018, 14:52

Often puzzled by any balancing or monitoring wires connected to each cell but has no fuse at the source end. One wire rubbing into a wire from a different voltage cell will start the melted process that ends in a fire. We build 12v and 24v house battery systems and wouldn't consider running any cabling from the cells without a fuse rated well within the max current rating for the wire size used.
I did see one that had data cable used for cell volt sensing. A short at the output end and it burnt through the cabling all the way back to the battery before it reached the end of the insulation and was able to melt the conductor, quite a big rewiring job.

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Re: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

Post by Richo » Thu, 27 Sep 2018, 12:48

Understandably a complete system balancer is cheaper than a per-cell module.
I can't stand all the wires personally.
I'll only have a per-cell BMS in my ev - no wires.
Costs a bit more but no chance of a wiring issue.

The black bootlaces are 1.5mm.
So 10-15A wire max.
18 wires in a bundle.
Sounds delightful.
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